1. Cairo, Illinois, USA
2. Cambridge, Illinois, USA
3. Carbondale, Illinois, USA
4. Carroll County, Illinois, USA
5. Centralia, Illinois, USA
6. Chadwick, Illinois, USA
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7. Champaign County, Illinois, USA (1)
8. Champaign, Illinois, USA
9. Chicago, Illinois, USA (2)
10. Clinton, Illinois, USA
11. Clintonia Township, Illinois, USA
12. Clyde Township, Illinois, USA
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13. Compton, Illinois, USA
14. Cook County, Illinois, USA (4)
15. Creston, Illinois, USA
16. Cumberland County, Illinois, USA
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